"Plagiarism is presenting another person's ideas, information, expressions, or entire work as one's own. . . . Plagiarism can take a number of forms, including buying papers from a service on the Internet, reusing work done by another student, and copying text from published sources without giving credit to those who published the sources. . . . Even borrowing just a few words from an author without clearly indicating that you did so constitutes plagiarism. Moreover, you can plagiarize unintentionally; in hastily taken notes, it is easy to mistake a phrase copied from a source as your original thought and then to use it without crediting the source. . . . It's important to note that you need not copy an author's words to be guilty of plagiarism; if you paraphrase someone's ideas or arguments without giving credit for their origin, you have committed plagiarism" (6-9).
MLA Handbook. 8th ed., Modern Language Association of America, 2016
"There are other acts of academic dishonesty that closely resemble plagiarism. Submitting the same paper in two courses means you are passing off work done in one course as work done in another course. Usually, dual submissions require the permission of both instructors" (51).
Storey, William Kelleher. Writing History: A Guide for Students. 5th ed., Oxford UP, 2016